Aerial photo taken on March 31, 2020 shows tea-picking workers harvesting tea leaves at a tea garden in Wudaoling Village of Yunyang District in Shiyan, central China's Hubei Province. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Cao Zhonghong/Xinhua)

Tea-picking workers harvest tea leaves at a tea garden in Wudaoling Village of Yunyang District in Shiyan, central China's Hubei Province, March 31, 2020. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Cao Zhonghong/Xinhua)

A tea-picking worker harvests tea leaves at a tea garden in Wudaoling Village of Yunyang District in Shiyan, central China's Hubei Province, March 31, 2020. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Cao Zhonghong/Xinhua)

A tea-picking worker harvests tea leaves at a tea garden in Wudaoling Village of Yunyang District in Shiyan, central China's Hubei Province, March 31, 2020. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Cao Zhonghong/Xinhua)

A tea-picking worker harvests tea leaves at a tea garden in Wufeng Tujia Autononous County in Yichang, central China's Hubei Province, March 31, 2020. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Wen Zhenxiao/Xinhua)

A tea-picking worker harvests tea leaves at a tea garden in Wudaoling Village of Yunyang District in Shiyan, central China's Hubei Province, March 31, 2020. Farmers in Hubei are busy harvesting tea ahead of the Qingming Festival to produce the Mingqian (meaning "pre-Qingming") tea, which is made of the very first tea sprouts in spring and considered to be of high quality. (Photo by Cao Zhonghong/Xinhua)